I feel like I'm imagining things. Enceladus, Pluto, Ganymede, Callisto, Ceres, Triton... All have zero kg of water. They are set at 90% Silicate and 10% Iron and that's dead wrong. Even without Water, frozen silicates and other organics should be there.
Even the Trappist worlds are probably super-ocean water worlds considering their low densities.
/Rant off